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Channel Coding: Theory, Algorithms, and Applications by Marc Fossorier, David Declercq, Ezio Biglieri

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image (11)

where Siimage is the encoder state after the encoding of bit diimage.

The LLR of bit diimage can then be expressed as

Λ(di)=lnΣmλi1(m)Σmλi0(m). (12)

image (12)

For the code of Figure 26, Λ(di) is written as

Λ(di)=λi1(0)+λi1(1)+λi1(2)+λi1(3)λi0(0)+λi0(1)+λi0(

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